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1220005 = 51731463
BaseRepresentation
bin100101001110110100101
32021222112101
410221312211
5303020010
642052101
713240603
oct4516645
92258471
101220005
11763676
124aa031
133393c7
1423a873
1519173a
hex129da5

1220005 has 16 divisors (see below), whose sum is σ = 1603584. Its totient is φ = 887040.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1220005 is 5000221.

It is not a de Polignac number, because 1220005 - 27 = 1219877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1219973 and 1220000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2404 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (100224).

21220005 is an apocalyptic number.

It is an amenable number.

1220005 is a deficient number, since it is larger than the sum of its proper divisors (383579).

1220005 is a wasteful number, since it uses less digits than its factorization.

1220005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 1220005 is about 1104.5383651101. The cubic root of 1220005 is about 106.8531189887.

Adding to 1220005 its reverse (5000221), we get a palindrome (6220226).

The spelling of 1220005 in words is "one million, two hundred twenty thousand, five".

Divisors: 1 5 17 31 85 155 463 527 2315 2635 7871 14353 39355 71765 244001 1220005